<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link href="https://cdn.bootcdn.net/ajax/libs/nprogress/0.2.0/nprogress.css" rel="stylesheet">
</head>
<body>
  <script src="https://cdn.bootcdn.net/ajax/libs/nprogress/0.2.0/nprogress.js"></script>
  <script>
    NProgress.start();

    setTimeout(() => {
      NProgress.done();
    }, 3000)
  </script>
</body>
</html>